Book Image

WordPress Plugin Development Cookbook - Third Edition

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook - Third Edition

By: Yannick Lefebvre

Overview of this book

WordPress is one of the most widely used, powerful, and open content management systems (CMSs). Whether you're a site owner trying to find the right extension, a developer who wants to contribute to the community, or a website developer working to fulfill a client's needs, learning how to extend WordPress' capabilities will help you to unleash its full potential. This book will help you become familiar with API functions to create secure plugins with easy-to-use administration interfaces. This third edition contains new recipes and up-to-date code samples, including new chapters on creating custom blocks for the block editor and integrating data from external sources. From one chapter to the next, you’ll learn how to create plugins of varying complexity, ranging from a few lines of code to complex extensions that provide intricate new capabilities. You'll start by using the basic mechanisms provided in WordPress to create plugins, followed by recipes covering how to design administration panels, enhance the post editor with custom fields, store custom data, and even create custom blocks. You'll safely incorporate dynamic elements into web pages using scripting languages, learn how to integrate data from external sources, and build new widgets that users will be able to add to WordPress sidebars and widget areas. By the end of this book, you will be able to create WordPress plugins to perform any task you can imagine.
Table of Contents (15 chapters)

Formatting admin pages using meta boxes

As a plugin's administration page becomes longer and more complex, it becomes important to divide its content into multiple sections. While standard HTML headers or fieldset tags could be used for this task, they lack the usefulness and nice visual appearance of meta boxes. Meta boxes are the containers that show up in many WordPress content editors, as well as on the main administration Dashboard page.

Beyond visually organizing content, meta boxes are very powerful, since they allow site administrators to collapse configuration sections that they don't use, reorder sections based on their needs, and even hide elements that they don't want to see.

Getting ready

You should have already followed the Accessing user settings from action and filter hooks recipe. Alternatively, you can get the resulting code (ch3/ch2-page-header-output/ch2-page-header-output-v9.php) from the book's GitHub page. You should rename the ch2...